Building OpenNI using a cross-compiler:

 Building OpenNI using a cross-compiler:
  1) Make sure to define two environment variables:
     - <platform>_CXX - the name of the cross g++ for platform <platform>
     - <platform>_STAGING - a path to the staging dir (a directory which simulates the target root filesystem).
     Note that <platform> should be upper cased.
     For example, if wanting to compile for ARM from a x86 machine, ARM_CXX and ARM_STAGING should be defined.
  2) Go into the directory: "Platform/Linux/CreateRedist".
     Run: "./RedistMaker <platform>" (for example: "./RedistMake Arm").
     This will compile everything and create a redist package in the "Platform/Linux/Redist" directory.
     It will also create a distribution in the "Platform/Linux/CreateRedist/Final" directory.
  3) To install OpenNI files on the target file system:
     Go into the directory: "Platform/Linux/Redist".
     Run the script: "./install.sh -c $<platform>_STAGING" (for example: "./install.sh -c $ARM_STAGING").
       The install script copies key files to the following location:
         Libs into: STAGING/usr/lib
         Bins into: STAGING/usr/bin
         Includes into: STAGING/usr/include/ni
         Config files into: STAGING/var/lib/ni
   
  To build the package manually, you can run "make PLATFORM=<platform>" in the "Platform\Linux\Build" directory.
  If you wish to build the Mono wrappers, also run "make PLATFORM=<platform> mono_wrapper" and "make PLATFORM=<platform> mono_samples".